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> there is a main cycle that runs hot

This is why you pre-run the hot water in the tap (assuming the dishwasher is attached to the hot water tap/pipe), so the dishwasher has hot water for the pre-wash already. Works for us for a better overall cleaning.

[indolering]

Then why don't manufacturers recommend this? Why don't dishwashers in Europe (which have access to higher voltages) run the prewash hotter?

It's because, as outlined in the linked article, hot water makes the problem of staining plastic worse. So they try to mechanically remove it before the main wash. Note that in the original video, the main wash heat temperature wasn't impacted by preheating the prewash.

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> Then why don't manufacturers recommend this?

They literally do! https://i.imgur.com/gCDuZZM.png

Rather than jumping into this whole thing in the middle, I'll ask you to begin from the beginning, catch up on what you missed on (the two earlier Technology Connections that were made before the submission article), so we can at least have the same base-level understanding of the situation first, then you can come back and we can argue the entire day.

[cityofdelusion]

I have a high end euro-style Bosch, largely seen as one of the best washers out there. No indication in the manual of running hot water. In fact the manual shows the temperatures that all the different cycles run at, and the "pre-rinse" cycle does not show a temperature. The manual also doesn't say to add any detergent other than the main cycle and recommends pacs. Its always at the top of industry testing, so I am thinking a random YouTuber might not be correct here.

[tguvot]

They literally don't. it's not in my manual and not in manual cheapest LG and GE machines that are currently available for sale

This screenshot is seems to be from manual of Frigidaire FDB520RHB or something similar that was discontinued 12 years ago or so.

Some of the programs of this dishwasher will heat water as needed, and in addition there is a button "hot wash".

showing manual of 20 years old machine today as proof for how machine should be operated it's just like arguing with todays doctor using 300 years old medical books.

things changed.

[tguvot]

i don't pre-run hot water in the tap. my dishwasher meant to run pre-wash with "whatever" water (and is quoted in article, having hot water in prewash can actually stain things) and it washes everything perfectly. in fact all dishwashers i ever had washed everything fine (as long as they didn't have physical malfunction).

if dishwasher manufacturer thought that prewash needs hot water, it would have heated it to appropriate temperature like it does when it needs to.